Alert archive / Iowa / Tornado Warnings in 2017
Tornado Warning 10, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this tornado warning at May 17, 2017, 3:01 PM CDT for Lyon County, Iowa. It was in force for 29 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- May 17, 2017, 3:01 PM CDT (20:01 UTC)
- Expired
- May 17, 2017, 3:30 PM CDT
- In force
- 29 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Storm-based polygon
- Tornado
- Radar indicated
- Hail
- 1.0 in
County Lyon County, IA
The radar
The Sioux Falls radar (KFSD), 62 km from the middle of the area, began a volume at 20:02 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| May 17, 12:08 PM CDT | Tornado Watch | SPC | 7 hr |
The nearest sounding before it
Omaha, NE (KOAX), launched 12:00Z, 8.0 hours before the alert went out and 228 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 121 J/kg
- Mixed-layer CIN
- -156 J/kg
- Mixed-layer LCL
- 1106 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 119 m²/s²
- 0-3 km storm-relative helicity
- 132 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
184
WFUS53 KFSD 172001
TORFSD
IAC119-172030-
/O.NEW.KFSD.TO.W.0010.170517T2001Z-170517T2030Z/
BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Sioux Falls SD
301 PM CDT WED MAY 17 2017
The National Weather Service in Sioux Falls has issued a
* Tornado Warning for...
Eastern Lyon County in northwestern Iowa...
* Until 330 PM CDT
* At 301 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Matlock, or 10 miles northwest of Sheldon, moving
north at 25 mph.
HAZARD...Tornado and quarter size hail.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed.
Damage to roofs, windows, and vehicles will occur. Tree
damage is likely.
* This dangerous storm will be near...
George around 310 PM CDT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.
&&
LAT...LON 4326 9610 4349 9615 4350 9595 4326 9588
TIME...MOT...LOC 2001Z 167DEG 22KT 4327 9601
TORNADO...RADAR INDICATED
HAIL...1.00IN
$$
Ferguson2 follow-up statements
155
WWUS53 KFSD 172018
SVSFSD
Severe Weather Statement
National Weather Service Sioux Falls SD
318 PM CDT WED MAY 17 2017
IAC119-172030-
/O.CON.KFSD.TO.W.0010.000000T0000Z-170517T2030Z/
Lyon IA-
318 PM CDT WED MAY 17 2017
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 330 PM CDT FOR EASTERN
LYON COUNTY...
At 317 PM CDT, a severe thunderstorm capable of producing a tornado
was located over George, or 10 miles southeast of Rock Rapids, moving
north at 20 mph.
HAZARD...Tornado.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed. Damage
to roofs, windows, and vehicles will occur. Tree damage is
likely.
This tornadic thunderstorm will remain over mainly rural areas of
eastern Lyon County.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.
&&
LAT...LON 4326 9610 4349 9615 4350 9595 4326 9588
TIME...MOT...LOC 2017Z 168DEG 16KT 4335 9599
TORNADO...RADAR INDICATED
HAIL...<.75IN
$$
Ferguson447
WWUS53 KFSD 172024
SVSFSD
Severe Weather Statement
National Weather Service Sioux Falls SD
324 PM CDT WED MAY 17 2017
IAC119-172032-
/O.EXP.KFSD.TO.W.0010.000000T0000Z-170517T2030Z/
Lyon IA-
324 PM CDT WED MAY 17 2017
...THE TORNADO WARNING FOR EASTERN LYON COUNTY WILL EXPIRE AT 330 PM
CDT...
The storm which prompted the warning has weakened below severe
limits, and no longer appears capable of producing a tornado.
Therefore the warning will be allowed to expire. However heavy rain
is still possible with this thunderstorm.
A tornado watch remains in effect until 700 PM CDT for northwestern
Iowa.
LAT...LON 4326 9610 4349 9615 4350 9595 4326 9588
TIME...MOT...LOC 2022Z 167DEG 22KT 4338 9600
$$
FergusonThe office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 16, 7:43 PM CDT | Severe Thunderstorm Warning | FSD | Ida | 33 min |
| May 16, 8:22 PM CDT | Severe Thunderstorm Warning | FSD | Buena Vista | 23 min |
| May 17, 11:16 AM CDT | River Flood Warning | FSD | Clay | 24 hr |
| May 17, 11:16 AM CDT | River Flood Warning | FSD | Buena Vista, Clay | 24 hr |
| May 17, 11:16 AM CDT | River Flood Warning | FSD | Plymouth, Sioux | 5 days |
| May 17, 11:16 AM CDT | River Flood Warning | FSD | Plymouth | 6 days |
| May 17, 11:16 AM CDT | River Flood Warning | FSD | Clay | 4 days |
| May 17, 11:16 AM CDT | River Flood Warning | FSD | Clay, Dickinson | 59 hr |
| May 17, 1:33 PM CDT | Tornado Warning | FSD | Sioux | 27 min |
| May 17, 1:56 PM CDT | Tornado Warning | FSD | Sioux | 34 min |
| May 17, 2:03 PM CDT | Tornado Warning | FSD | Sioux | 27 min |
| May 17, 2:28 PM CDT | Tornado Warning | FSD | Lyon, Sioux | 32 min |
| May 17, 2:34 PM CDT | Severe Thunderstorm Warning | FSD | Lyon | 26 min |
Nearby
Tornado Warnings in Iowa, 2017Every tornado warning in 2017Tornadoes in 2017
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.